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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

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Just wanted to second gvSIG Mini. Works great on my phone.
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radekJul 21 '11 at 11:04

We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

Geopaparazzi is a tool developed to do very fast qualitative engineering/geologic surveys. Even if the main aim is in the field of surveying, it contains tools that can be of great use also to OpenStreetMappers as well as tourists that want to keep a geo-diary. Geopaparazzi is available on the Android Market.

oruxmaps provide online map browsing, offline map browsing (you can save locally Google maps, openstreet etc, but you can also make your own raster maps), route recording etc. Is the most complete GIS software for mobile i came across.

I created a free app and put it on the Android Market Place to show your TileCache in 3D to support another project I did. It is not definitely a full on GIS app, but it allows you run your own TileCache server and see it on your phone or tablet. I am adding a querying feature quite soon.

Definitely Mappt. Ive used it now for the past couple of days. Im using it for field data collection of leaf samples from insect damaged trees and its just so easy to use. One great feature is the way the editing 'points' move out from under your finger so you can see the image below.

According to their website it only has KML capabilities for the time being. Here is a screen grab of how I am using it. Hope this helps.

We develop a mobile GIS solution for Android tablets called Mappt, which has a free trial available from the Google Play store. The trial version allows you access to all functionality of the software, with the exception that you can not export your data.

Field Tracer is an application designed for simple GPS/GIS (geographic information system) mapping. Field Tracer requires no external hardware for basic operation; in the future for higher accuracy GPS mapping the program will connect to external GPS antennas using our RS-232 to Bluetooth converter. For example, a John Deere RTK globe could be used for sub-inch accuracy.
Field Tracer delivers efficiency improvements and cost-savings at every stage of your operation. It works on readily available and easily affordable hardware in a variety of sizes and specifications to meet your needs. Another advantage is the use of Dropbox as a platform for storing and accessing data. This means anytime access to your data from smartphones, tablets, PCs and laptops. It also means seamless backups and easy access for employees or customers.

OsmAnd or in GooglePlay which is an excellent App which allow you to download OSM maps for all the world in vector format... so it is very useful (to find place by name for example) and you can have mountain shadow, elevation lines, etc.
You can easily also register waypoint or tracks which are saved in GPX. GPX tracks or points can also be load and visible on maps... It is very useful app.

CyberTracker and the associated Wiki which allow you to create personalised forms to collect easily data with mobile devise, especially with Windows Mobile and Android. It is very stable. You design your form on your computer, then, you deploy it on mobile devises. It allow you to collect informations, take picture, register voice, register point or tracks. Then, data can be upload directly through FTP or by usb cable. Users can upload and see data on their own computers without be able to modify the apps (so it is safe). Data can be connected with database (MicrosoftSQL server, Microsoft Access or MySQL).

I'm working on this and I have just published a GIS application: ItacaMap for Android ( https://play.google.com/store/apps/details?id=com.itacasoft.itacamap ). At the moment you can see basic functionality (zoom, pan, view info, browse, select by rectangle, etc.), but I have already implemented edit functionalities (at least on the server side) and more is cooking.
If you are interested, please contact me (contacts information on the product page).

Found an app called MapItFast that is easy to use. A free version that lets you gather point, line, polygon features and even photos. I've used it for its basemaps and to calculate distance and area. Unfortunately, the data stays on the device (no way to export or share..that I can find) without upgrading to the cloud services. But that looks interesting since data can be exported to CSV, GPX, SHP and KMZ, it has built in synchronization to collaborate on mapping and location, full attribution, editing, and probably a bunch of other stuff I don't know about yet. Might be useful to those folks doing group mapping on an Android and wanting a way to get it into Google Maps or ArcGIS. I like the idea of a low cost Internet Map Server and tools.

Geospago is a new application. It is a software-as-a-solution (SaaS) because it has a mobile application working in conjunction with a web application. Both may be used for collecting/inputting data, editing/updating data, viewing/sharing data, and importing/exporting data. The web portal runs on amazon with geoserver and syncs with the android app, which uses SQLite.

The web portal is used to invite/manage users, control user access to projects, create projects and custom forms, deploy the forms to users, and manage data. It can import SHP & CSV files for data maintenance workflows. It can export data to the standard formats (CSV, KML, SHP), but aslo provides feeds and an API. This allows users to add a WFS feed to ArcMap or QGIS to see the data live from the cloud, a network link to Google Earth, or create your own script to pull the data through API requests to integrate with other systems. Collecting data is easy as well as quickly getting new or updated data back into a enterprise system of record. Geospago is the only app I have seen so far that provides this.

The mobile app is used to collect, view, and edit data (point, line, and polygon). It runs on both phones and tablets. It handles connected and disconnected environments through the use of mbtiles. It allows multiple photos to be attached to a single record. It also has barcode scanning and signature capabilities. Synchronization is set to user specified intervals or can be manually forced. This prevents overlap and duplication if you have multiple people collecting data for the same projects in connected areas.

Geospago is very affordable and available on a monthly, per-license pricing model that it can be frozen between projects or cancel-at-any-time basis so you can use it only when you need it. Data is secure on Amazon cloud and can be download it at any time.

The Geospago website has more information and has a sign up link. The website also has a link to the mobile app on the Google Play Store.

Welcome to GIS SE! Something you need to be aware of is that "The community tends to vote down overt self-promotion and flag it as spam. Post good, relevant answers, and if some (but not all) happen to be about your product or website, that’s okay. However, you must disclose your affiliation in your answers.". Would you be able to disclose your affiliation with Geospago by editing your Answer, please?
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PolyGeo♦Feb 13 '14 at 7:23

@PolyGeo Isn't the "we too" in the first line good enough? I have a hard time construing this as spam (unsolicited commercial messages) given it responds to a request for exactly this kind of information.
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whuber♦Feb 13 '14 at 20:28

@whuber I don't think I flagged this as spam, but correct me if I did, but I certainly downvoted. I saw marketing speak (aka self-promotion) in "We too were tired of banging our heads against a wall", "but best of all" twice (how can two things be best of all?), "the real trick is" and "It even has". I think the last paragraph should be moved to the user's card and replaced by a statement like "Disclosure: I am the XXX of the company that developed this product".
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PolyGeo♦Feb 13 '14 at 21:47

@Poly Thank you for your comments. (Someone did flag this post as spam, which is why it came to my attention.) I notice that at least one other post in this thread takes a similar third-person narrative approach to identifying their association with a product, but nobody objected. I thoroughly agree that it's desirable to remove marketing hype from our site. (I have worked hard to remove it from many tag wikis, for instance.) It is an article of faith with me that a candid discussion of a product, without exaggeration, will interest more people and eventually make more sales.
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whuber♦Feb 13 '14 at 22:02

@PolyGeo Thank you for your suggestions. I have modified to remove marketing speak and state just the facts. In addition I have updated my profile and added my linked1n profile as my website so anyone is welcome to my disclosures. I hope this helps promote continued candid discussion.
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Kalvan HoneMar 26 '14 at 15:30

It's the only app on Google Play that automatically compares a user-entered ground truth location to GPS data from the mobile device to calculate true accuracy of the GPS. Other apps will only show the estimated location error that is calculated by the device, which (as GPS Benchmark shows) can be far from accurate.

While setting a ground truth location via tapping on the map is convenient, it can be limiting in terms of accuracy and precision. The app also supports typing in a known ground truth location lat/long/alt, which bypasses any potential map issues. To make manual entry less cumbersome, it also supports capturing a "geo:"-encoded location from a QR Code (encoded with a QR Code generator such as ZXing) or NFC tag, which can be written using any NFC tag reader (including an option in GPS Benchmark to write the current ground truth location to an NFC tag).

GPS Benchmark exports the data as well as the results to KML and CSV formats, which are both compatible with ArcGIS products, as well as other GIS products.

The first image below is a screenshot of the GPS Benchmark app collecting data and calculating true error, and the second image is a screenshot of the results (green = 95th percentile, yellow is 68th percentile, and red is 50th percentile of horizontal error) being visualized in Google Earth.

I like QGIS for android as it accepts both esri shape files and mapinfo tab files, and you can do thematic mapping as well as displaying geotiffs. You can edit shape files easily and use the built in gps if you have one, however it crashes my tablet if you are not located within the bounds of the map.
Otherwise it is excellent and the devs are working on python compatibility meaning you will be able to use google and bing maps as well as open streets etc.

The main issues are that the gui is designed for a standard screen and all the buttons and icons are tiny on anything smaller than a 10" screen.

For basic navigation and data entry on a custom map, i was using avenzas' pdf maps on iOs, which imports geo-registered PDFs. They have a beta for android which I haven't used but am planning on trialling. you can make geo-registered pdfs in mapinfo or arcmap.

We developed a new service for mobile GIS on tablets called GIS 2go (www.gis2go.com). It includes an native app for tablets (Android or iPads) as well as an add-in for ArcGIS to prepare your maps for use in the app.

It allows also offline-use of the maps.

While on the go, you can as well redline, make notes, photos etc. and sync you notes back to ArcGIS.

You can download the app and the add-in from the website www.gis2go.com. A free demo-account is also available.